According to this message, Julian Field, the main developer of MailScanner, was found collapsed at his home last Friday. More details via the SA list:
He is in ICU though stable condition. I’ll not go into any details, anyone interested and not on the MS list can read the thread on the MS archive.
Currently any plans for cards and such as are on hold until further instructions are given to the MS list. However Matt Hampton has setup a clustermap at this address.
Matt will also forward any well wishes left on the website along with the map. Visiting the page will show Julian and his family just how far reaching his software is and how many people appreciate his efforts.
Get well, Julian! :(